diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index ea374ed..3875e99 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -46,6 +46,10 @@
 #include <stdlib.h>
 #include <time.h>
 
+#if defined _MSC_VER && !defined strcasecmp
+#define strcasecmp _stricmp
+#endif
+
 /*
  * Key material generation
  */